netdev - Re: [PATCH iproute2 1/4] bridge: Do not print stray prefixes in monitor mode

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Date:   Thu, 22 Sep 2022 08:28:54 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Benjamin Poirier <bpoirier@...dia.com>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH iproute2 1/4] bridge: Do not print stray prefixes in
 monitor mode

On Thu, 22 Sep 2022 15:19:35 +0900
Benjamin Poirier <bpoirier@...dia.com> wrote:

> When using `bridge monitor` with the '-timestamp' option or the "all"
> parameter, prefixes are printed before the actual event descriptions.
> Currently, those prefixes are printed for each netlink message that's
> received. However, some netlink messages do not lead to an event
> description being printed. That's usually because a message is not related
> to AF_BRIDGE. This results in stray prefixes being printed.
> 
> Restructure accept_msg() and its callees such that prefixes are only
> printed after a message has been checked for eligibility.
> 
> The issue can be witnessed using the following commands:
> 	ip link add dummy0 type dummy
> 	# Start `bridge monitor all` now in another terminal.
> 	# Cause a stray "[LINK]" to be printed (family 10).
> 	# It does not appear yet because the output is line buffered.
> 	ip link set dev dummy0 up
> 	# Cause a stray "[NEIGH]" to be printed (family 2).
> 	ip neigh add 10.0.0.1 lladdr 02:00:00:00:00:01 dev dummy0
> 	# Cause a genuine entry to be printed, which flushes the previous
> 	# output.
> 	bridge fdb add 02:00:00:00:00:01 dev dummy0
> 	# We now see:
> 	# [LINK][NEIGH][NEIGH]02:00:00:00:00:01 dev dummy0 self permanent
> 
> Fixes: d04bc300c3e3 ("Add bridge command")
> Signed-off-by: Benjamin Poirier <bpoirier@...dia.com>
> ---

Looks good, reminds me that the bridge command need to be converted
to use json_print.